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#ifndef ITEM_XMLFUNC_INCLUDED
#define ITEM_XMLFUNC_INCLUDED
/* Copyright (c) 2000-2007 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/* This file defines all XML functions */
typedef struct my_xml_node_st MY_XML_NODE;
class Item_xml_str_func: public Item_str_func
{
protected:
/*
A helper class to store raw and parsed XML.
*/
class XML
{
bool m_cached;
String *m_raw_ptr; // Pointer to text representation
String m_raw_buf; // Cached text representation
String m_parsed_buf; // Array of MY_XML_NODEs, pointing to raw_buffer
bool parse();
void reset()
{
m_cached= false;
m_raw_ptr= (String *) 0;
}
public:
XML() { reset(); }
void set_charset(CHARSET_INFO *cs) { m_parsed_buf.set_charset(cs); }
String *raw() { return m_raw_ptr; }
String *parsed() { return &m_parsed_buf; }
const MY_XML_NODE *node(uint idx);
bool cached() { return m_cached; }
bool parse(String *raw, bool cache);
bool parse(Item *item, bool cache)
{
String *res;
if (!(res= item->val_str(&m_raw_buf)))
{
m_raw_ptr= (String *) 0;
m_cached= cache;
return true;
}
return parse(res, cache);
}
};
String m_xpath_query; // XPath query text
Item *nodeset_func;
XML xml;
bool get_xml(XML *xml_arg, bool cache= false)
{
if (!cache && xml_arg->cached())
return xml_arg->raw() == 0;
return xml_arg->parse(args[0], cache);
}
public:
Item_xml_str_func(THD *thd, Item *a, Item *b): Item_str_func(thd, a, b)
{
maybe_null= TRUE;
}
Item_xml_str_func(THD *thd, Item *a, Item *b, Item *c):
Item_str_func(thd, a, b, c)
{
maybe_null= TRUE;
}
bool fix_fields(THD *thd, Item **ref);
void fix_length_and_dec();
bool const_item() const
{
return const_item_cache && (!nodeset_func || nodeset_func->const_item());
}
};
class Item_func_xml_extractvalue: public Item_xml_str_func
{
public:
Item_func_xml_extractvalue(THD *thd, Item *a, Item *b):
Item_xml_str_func(thd, a, b) {}
const char *func_name() const { return "extractvalue"; }
String *val_str(String *);
Item *get_copy(THD *thd, MEM_ROOT *mem_root)
{ return get_item_copy<Item_func_xml_extractvalue>(thd, mem_root, this); }
};
class Item_func_xml_update: public Item_xml_str_func
{
String tmp_value2, tmp_value3;
bool collect_result(String *str,
const MY_XML_NODE *cut,
const String *replace);
public:
Item_func_xml_update(THD *thd, Item *a, Item *b, Item *c):
Item_xml_str_func(thd, a, b, c) {}
const char *func_name() const { return "updatexml"; }
String *val_str(String *);
Item *get_copy(THD *thd, MEM_ROOT *mem_root)
{ return get_item_copy<Item_func_xml_update>(thd, mem_root, this); }
};
#endif /* ITEM_XMLFUNC_INCLUDED */
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